Some Companies Are Expanding Their Doctor and Hospital Networks

Health insurers in several states are adding to the choices of doctors and hospitals in their health-law plans amid concerns among some consumers and state officials about access to care.

In states including New York, Connecticut and Ohio, insurers have bolstered their health-care provider networks in recent months. In California, three of the biggest insurers—WellPoint Inc.'s Anthem Blue Cross, Blue Shield of California and Health...